Kilocalories to joules converter
Joules (J)
1 kilocalorie = 4,184 joules
How to convert kilocalories to joules
J = kcal × 4184
Multiply the number of kilocalories by 4184 to get joules. Going the other way, divide by 4184 (or multiply by 0.000239005736138).
One kilocalorie is exactly defined as 4184 joules (to 12 significant figures), and one joule is 0.000239005736138 kilocalories.
Worked examples
- Convert 5 kilocalories: 5 × 4184 = 20,920 20,920 joules.
- Convert 12.5 kilocalories: 12.5 × 4184 = 52,300 52,300 joules.
- Convert 250 kilocalories: 250 × 4184 = 1,046,000 1,046,000 joules.
Quick-reference table
| kcal | J |
|---|---|
| 1 | 4,184 |
| 2 | 8,368 |
| 3 | 12,552 |
| 5 | 20,920 |
| 10 | 41,840 |
| 15 | 62,760 |
| 20 | 83,680 |
| 25 | 104,600 |
| 50 | 209,200 |
| 75 | 313,800 |
| 100 | 418,400 |
| 1,000 | 4,184,000 |
| J | kcal |
|---|---|
| 1 | 0.0002390057361 |
| 2 | 0.0004780114723 |
| 3 | 0.0007170172084 |
| 5 | 0.001195028681 |
| 10 | 0.002390057361 |
| 15 | 0.003585086042 |
| 20 | 0.004780114723 |
| 25 | 0.005975143403 |
| 50 | 0.01195028681 |
| 75 | 0.01792543021 |
| 100 | 0.02390057361 |
| 1,000 | 0.2390057361 |
Related conversions
Frequently asked questions
How many joules are in 1 kilocalorie?
1 kilocalorie equals 4,184 joules.
What is the formula to convert kilocalories to joules?
Use J = kcal × 4184. Multiply the number of kilocalories by 4184 to get joules. Going the other way, divide by 4184 (or multiply by 0.000239005736138).
What is 100 kilocalories in joules?
100 kilocalories is 418,400 joules.